Field emission display device and method of manufacturing same

Abstract

In a field emission display device, an opening dimension in a predetermined direction (or x direction) of an opening of a control electrode is greater than an opening dimension in the predetermined direction of an electron pass aperture of a shield electrode, and the shield electrode is located at the front of the control electrode so that the entire range of the opening dimension in the predetermined direction of the electron pass aperture is within the range of the opening dimension in the predetermined direction of the opening of the control electrode.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a field emission display device capable of improving light emission uniformity of a phosphor surface (or display surface) of the field emission display device, and a method of manufacturing the same.[0003]2. Description of the Background Art[0004]In general, a field emission display device principally includes a cathode substrate formed with cathode electrodes, an insulating layer formed on the cathode substrate and the cathode electrodes, control electrodes formed on the insulating layer, electron emission material layers received in openings formed through the control electrodes and the insulating layer and formed on exposed portions of the cathode electrodes at the bottom of the openings, and an anode substrate located at the front of the control electrodes and formed with anode electrodes and phosphors (U.S. Pat. No. 3,500,102 (See FIGS. 1 to 4) and U.S. Pat. No. 4,857,799 (See FIGS....

AI Technical Summary

Benefits of technology

[0010]It is a first object of the present invention to provide a field emission display device capable of achieving the assembly of a shield electrode without the need for high assembly accuracy so that the light emission uniformity of a phosphor surface (or a display surface) of the field emission display device is maintained.

[0011]It is a second object of the present invention to provide a method of manufacturing a field emission display device capable of densely forming openings in a control electrode and an insulating layer, thereby to increase the intensity of an electron beam.

[0013]Therefore, if the assembly position of the shield electrode is shifted in the predetermined direction, the field emission display device can eliminate variations in the area in which the opening area of each electron pass aperture of the shield electrode overlaps the opening area of the corresponding opening of the control electrode. Thus the field emission display device can eliminate variations in the intensity of the electron beam flowing to each of the phosphors. This achieves the assembly of the shield electrode without the need for high assembly accuracy so that light emission uniformity of a phosphor surface (or display surface) of the field emission display device is maintained.

[0015]The method produces the effects of: (1) allowing the flow of chemical solution to effectively spread to the bottom of the opening formed through the control electrode and the insulating layer; and (2) forming the opening in a relatively short period of time. The above-mentioned effect (1) allows the flow of chemical solution to spread sufficiently to the bottom of the opening if an opening dimension in a direction orthogonal to the longitudinal direction of the substantially rectangular opening of the control electrode is decreased to some extent. This achieves the formation of the opening of an elongated shape. The above-mentioned effect (2) prevents the chemical solution from eroding the periphery of the opening more than expected and, accordingly, providing the greater opening area of the opening than expected. This reduces the spacing between the opening and its adjacent opening. These effects provide the elongated openings closely spaced apart from each other (or densely formed), to increase the intensity of the electron beam flowing to each phosphor.

Problems solved by technology

Further, if a shift of the assembly position of the shield electrode causes a difference between phosphors in the area in which the opening area of the corresponding electron pass aperture of the shield electrode overlaps the opening areas of the corresponding openings of the control electrodes, variations in the intensity of the electron beam flowing to the phosphors give rise to nonuniform amounts of light emission from the phosphors, resulting in a problem such that the light emission uniformity of a phosphor surface (display surface) of the field emission display device is impaired.

Moreover, such defective products lead to increased manufacturing costs.

Furthermore, because the openings formed through the control electrodes and the insulating layer are circular in shape, the reduction in the diameter of the openings makes it difficult for the developer flow to spread to the bottoms of the openings during the formation of the openings.

This requires much time for the formation of the openings and makes it difficult to form the openings.

For this reason, the diameter of the openings must be large, which results in a problem such that the openings cannot be formed densely, and the intensity of the electron beam decreases.

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